Migration::get() deprecated

Migration->get() is deprecated, use individual property getters instead.

Before

$destination = $migrationObj->get('destination');
$destination_ids = $migrationObj->get('destinationIds');
$source = $migrationObj->get('source');
$high_water_property = $migrationObj->get('highWaterProperty');
$task_last_imported = $migrationObj->get('trackLastImported');
$process = $migrationObj->get('process');

After

$destination = $migrationObj->getDestinationConfiguration()
$destination_ids = $migrationObj->getDestinationIds();
$source = $migrationObj->getSourceConfiguration();
$high_water_property = $migrationObj->getHighWaterProperty();
$task_last_imported  = $migrationObj->getTrackLastImported();
$process = $migrationObj-> getProcess();